1. Management Information Systems - Introduction

2. The telecommunication system Telecommunication System – consists of hardware and software that transmits information from one location to another Can transmit text, data, graphics, voice, documents, or full motion video information Two basic types of signals: Analog signals are continuous waves that transmit information by altering the characteristics of the waves

3. Communications Media and Channels Communication channels – is used for data to be communicated from one location to another. Cable or wire line media use physical wires or cables to transmit data and information Twisted-pair wire is the most prevalent form of communications wiring. Coaxial cable – consists of insulated copper wire. Fiber optic cable consist of thousands of very thin filaments of glass fibers that transmit information via light pulses generated by lasers.

4. Twisted-Pair Wire Consists of strands of copper wire twisted in pairs

5. Coaxial Cable Consists of insulated copper wire

6. Fiber-optic Cables Consists of thousands of very thin filaments of glass fiber that transmits information via light pulses generated by lasers

7. Transmission Speed Bandwidth refers to the range of frequencies available in any communications channel. Bandwidth is a very important concept in communications because the transmission capacity of any channel (stated in bits per second of bps) is largely dependent on its bandwidth. Narrowband channels typically provide low-speed transmission speeds up to 64Kbps to 2Mbps Broadband channels provide high-speed transmission rates ranging from 256Kbps up to several terabits per second

8. Speeds of Particular Communication Channels Twisted-pair wire up to 1 Gbps Microware up to 600 Mbps Satellite up to 600 Mbps Coaxial cable up to 1 Gbps Fiber-optic cable more than 40 Tbps

9. Types of Networks Computer network is a system that connects computers via communications media so that data can be transmitted among them Local Area Networks connects two or more devices in a limited geographical region, usually within the same building, so that every device on the network can communicate with every other device Wide Area Networks are generally provided by common carriers, that cover a wide geographic area Enterprise network is a network composed of interconnected multiple LANs and WANs

10. Protocols Protocol is the set of rules and procedures governing transmission across a network TCP/IP (transmission Control Protocol/Internet Protocol) – a file transfer protocol that can send large files of information across sometimes unreliable networks with assurance that the data will arrive uncorrupted IP (Internet Protocol) – a set of rules responsible for disassembling, delivering, and reassembling packets over the Internet Gateway – a communications processor that connects dissimilar networks by translating from one set of protocols to another

11. Types of Network Processing Client/Server computing – form of distributed processing in which some machines (servers) perform computing functions for end-user PCs (clients Peer-to-peer (P2P) processing – a type of client/server distributed processing that allows two or more computers to pool their resources, making each computer both a client and a server

12. Peer-to-Peer

13. Token-Ring

14. Client-Server